CVE•Published 2026-06-23•Modified 2026-07-30•0 articles on news•4 live references•NVD data

CVE-2026-55655Openbsd · Openssh

Vulnerability data via NVD (ingested)

CVSS v3.1

5.0

MEDIUM

CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:L/A:N

EPSS percentile

Exploit Prediction Scoring System · top 99% of all CVEs

Weaknesses (CWE)

CWE-923Improper Restriction of Communication Channel to Intended Endpoints

Description

A flaw was found in OpenSSH. A local unprivileged attacker on a Linux client host can hijack client-side X11 forwarding connections. This is possible by pre-binding the preferred abstract X socket name when X11 forwarding is enabled and a local UNIX-domain X socket is used. A successful attack can compromise the confidentiality of forwarded X11 traffic, including sensitive window contents and input, and may allow some manipulation of the forwarded session.

Timeline

Published 2026-06-23

Modified 2026-07-30

External references

NVD MITRE Exploit-DB VulnCheck

Search for exposed instances

Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common). Live host counts are a Premium feature.

Shodan · vuln tag

vuln:CVE-2026-55655

Hosts Shodan has explicitly fingerprinted as vulnerable.

Shodan · product

product:"Openbsd Openssh"

All exposed Openbsd Openssh instances — cross-reference with the CVE's affected-version range.

Shodan · banner/body mention

http.html:"Openssh"

HTTP body or banner mentions "Openssh" — catches deploys Shodan didn't identify as a product.

More intel sources (5)

Shodan report

vuln:CVE-2026-55655